noun, plural sul·ci [suhl-sahy] /ˈsʌl saɪ/.
a furrow or groove.
Anatomy. a groove or fissure, especially a fissure between two convolutions of the brain.
Origin of sulcus
1655–65; Latin: furrowRelated formssub·sul·cus, noun, plural sub·sul·ci.
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for sulcus
Historical Examples of sulcus
There is only one ciliated groove, the sulcus, in the stomodaeum.
These grooves are known as the sulcus and sulculus, and will be more particularly described hereafter.
Each zooid has six tentacles; the stomodaeum is elongate, but the sulcus and sulculus are very feebly represented.
The sulcus is bifurcate; the fork is near the base and almost gives the appearance of two sulci on some specimens.
It is then carried across the sulcus and is made to emerge through the opposite lip of the cervix.
British Dictionary definitions for sulcus
noun plural -ci (-saɪ)
a linear groove, furrow, or slight depression
any of the narrow grooves on the surface of the brain that mark the cerebral convolutionsCompare fissure
Word Origin for sulcus
C17: from Latin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sulcus
plural sulci, Latin, literally "furrow, trench, ditch, wrinkle."
Online Etymology Dictionary, © 2010 Douglas Harper
n. pl. sul•ci (-kī, -sī)
Related formssul′cal adj.
Any of the grooves on the brain surface, bounding the gyri; a fissure.
A long narrow groove or depression, as in an organ or a tissue.
The American Heritage® Stedman's Medical Dictionary
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